3 weeks ago Grade -10 (SEE) Chemistry

Carbondioxide passed through Water

What happens when carbon dioxide is passed through lime water for short and long period of time?

1 Answer

3 weeks ago Tribhuvan University > Institute of Science and Technology > B.Sc. (CSIT)

When Carbon dioxide is passed through water for short time (limited supply)

When CO2 is passed through water for short period of time (limited supply) it react and forms calcium carbonate which is insoluble in water and hence the solution becomes turbid or forms a milky white precipitate. The reaction is given as : 

Ca(OH)2 (aq) + CO2 (g) →  CaCO3 (s) + H2

When Carbon dioxide is passed through water for long time (excess supply)

When CO2 is passed through lime water in excess, the turbidity disappears as the calcium bicarbonate gets formed which is soluble in water and hence a clear solution is observed. The reaction is given as

CaCO3 (s) + H2O (l) + CO2 (g) →  Ca(HCO3)2 (aq)

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